42 Questions
What is the primary cause of anoxia?
Lack of oxygen
When does the dilutor demand regulator function?
When the user inhales
Which method is recommended for measuring moisture in an oxygen system?
Employing a hygrometer that measures dew point
How are oxygen cylinder test dates typically indicated?
Painted in white on the cylinder
If an oxygen system pressure has leaked away after charging, which component is most likely the cause?
The breathing regulator
Where would you most likely find the cause of a leak in an oxygen system?
A loose connection or fitting
How often should oxygen bottles be tested and inspected?
every 4 years
What is the typical capacity of an oxygen bottle?
80 - 2250 litres
Where are the oxygen bottle test and working pressures typically found?
stamped on the neck ring
What is the recommended position for the oxygen bottle on/off valve after installation?
wire locked in the 'on' position
How is dangerous pressure rise in oxygen cylinders relieved?
by a bursting disc
What pressure range should oxygen cylinders be left at to avoid condensation forming?
200/300 p.s.i.
What determines the material used for oxygen pipelines?
The pressure used in the system
How is the direction of flow in an oxygen non-return valve indicated?
by an arrow
What material are oxygen filters typically made of?
sintered bronze
What is used to indicate satisfactory operation of the oxygen system?
flow indicators
What happens when an aircraft suddenly drops pressure at 14,000 ft?
Masks drop automatically
How is an over-pressurized oxygen cylinder indicated?
A green rupturing disc
What is the typical life span of an aircraft oxygen cylinder?
5 years
How is a discharged chemical oxygen generator indicated?
A change in color
What is the minimum supply duration of a chemical oxygen generator?
15 minutes
How should the oxygen line service valve be secured?
Wire locked open
Aircraft capable of flying above what altitude must carry oxygen equipment?
10,000 ft
What is the approximate critical altitude for oxygen requirement?
25,000 ft
If oxygen is not being supplied in normal flight conditions, what should the cabin altitude be?
At or below 8,000 ft
Above what altitude must pressure breathing systems be used?
Above 40,000 ft
At what altitude do the oxygen masks deploy automatically?
3042 meters
What are oxygen cylinders normally fitted with?
Pressure and quantity gauges
When does a demand regulator in a portable oxygen bottle open?
When breathing
What color are American-made crew oxygen cylinders?
Green with a RH thread
Which connector has a left-hand thread in an oxygen system?
O2
'What is the principle of an O2 generator?'
Sodium chlorate and iron mixed by an electronic detonator
What pressure are oxygen cylinders usually pressurized to?
1800 PSI
Once charged, what should be done to oxygen storage cylinders?
Turned on and safety wire-locked
Where are the left-handed threads found in an oxygen system?
Charging connection
How does a portable O2 diluter demand valve work?
The user breathes in
What type of material should be avoided when working in the vicinity of an oxygen system?
Traces of oils or greases
What is the operating temperature of a chemical oxygen generator?
$45^\circ$C at 10 psi for 15 minutes
When charging an oxygen bottle in-situ, what should be done?
Charge in accordance with the temperature/pressure graph
What does the gauge fitted to an oxygen bottle indicate?
Pressure
How should thread lubrication tape be applied in an oxygen system?
Applied to all except the first two threads and not more than 3 complete wraps of tape
How is an expended chemical oxygen generator indicated?
By a change in color of heat sensitive paint
Test your knowledge on anoxia and dilutor demand regulator functions in the aviation industry. Questions cover the causes of anoxia and the operation of dilutor demand regulators. Find out if you can correctly identify the correct answers and explanations.
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